B2263

Code

Generic B — Body

Occupant Classification System Sensor Circuit Fault

Brand: Generic

Type: B — Body

Views: UK: 3 EN: 9 RU: 3

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in OCS sensor wiring harness
Corroded, loose or damaged connector at the seat sensor or airbag control module
Failed occupant classification sensor (pressure/weight/capacitance mat)
Faulty SRS/airbag control module or software error
Water/moisture intrusion into the seat or connector
Aftermarket or non‑OEM seat cover/seat components affecting sensor readings

Symptoms

SRS/airbag warning lamp illuminated on instrument panel
Passenger airbag status shows OFF or incorrect status
Airbag system self‑diagnosis stores B2263 and may disable passenger airbag
Seat weight/occupancy indicator incorrect or inconsistent
Possible related codes in SRS network

What to check

Read all stored SRS codes and freeze‑frame data with a capable scan tool; note related codes
Visual inspection of seat cushion area, sensor mat and connectors for damage, corrosion or moisture
Inspect wiring from seat to floor and underseat module for chafing, pinches or broken wires
Check connector terminals for bent/pushed‑out pins and secure mating
Measure reference supply voltage to sensor at the connector (compare to SRS spec) and check ground continuity
Measure sensor output signal (voltage or resistance) with seat unoccupied and occupied (use known test weight)

Signal parameters

Signal type: typically low‑voltage analog (resistive/capacitive) or proprietary digital to SRS module — depends on vehicle
Reference supply: commonly a low voltage reference from SRS module (e.g., ~5 V) or module‑supplied excitation (measure per manufacturer spec)
Expected idle signal: stable within the low‑voltage reference window (0–5 V) when unoccupied; changes measurably when occupied — consult OEM values
Resistance behavior: sensor mat often shows finite resistance or capacitance change; open circuit = infinite resistance; short = near 0 Ω
Fault signatures: open circuit (no signal/infinite resistance), short‑to‑ground (~0 V) or short‑to‑battery (~battery voltage), intermittent signal when harness is moved

Diagnostic algorithm

Use an SRS‑capable scan tool to read code B2263 and any related SRS codes; record freeze‑frame and live data.
Confirm fault is current: clear code, perform functional test (sit in passenger seat or place a known standard weight) and watch live sensor values; note whether code returns.
Visually inspect the passenger seat cushion, sensor mat and connectors for water, damage or foreign objects; remove seat cover if required per OEM procedure.
Disconnect battery and follow SRS safety procedures before removing seat or handling SRS components.
With battery reconnected and scanner monitoring, backprobe the sensor connector: verify reference voltage and ground are present and within OEM tolerance.
Measure sensor output (voltage or resistance) unoccupied and with known weight; compare to specification to determine if sensor responds correctly.
Perform continuity and resistance checks on wiring between sensor connector and airbag module; repair any opens/shorts and replace damaged connectors/pins.
If wiring and connectors are good but sensor output is out of spec, replace the occupant classification sensor/mat assembly per manufacturer instructions.
If problem persists after harness and sensor replacement, consider SRS control module fault and follow module‑level diagnostic procedures (may require module programming).
After repair, clear codes, perform built‑in SRS self‑tests and verify passenger airbag status returns to normal; retest with weight to confirm operation.

Likely causes

Damaged harness or pin corrosion at seat‑mounted connector (most common)
Failed sensor mat due to wear or water damage
Connector pushed out or terminal backing out after service/seat removal
Interference from heavy aftermarket seat cover or objects left on seat

Fault status

⚠️ Status

B2263 — Occupant Classification System Sensor Circuit Fault: SRS module detected an abnormal or missing signal from the passenger seat occupant sensor circuit; passenger airbag status may be incorrect or disabled.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours